user
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Search online and give an accurate definition to a given concept.

### Input:
The concept is blockchain

### Response:
assistant
Blockchain is an encrypted digital record of transactions that is organized in a distributed ledger system. The records or "blocks" are linked together using cryptography and stored on public or private networks. Each block contains the transaction data, a timestamp, and a link to the previous block in the chain, thus forming a chain of blocks and creating an immutable ledger of transactions.